1 package org.apache.lucene.queryParser.standard.processors;
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20 import java.util.List;
22 import org.apache.lucene.queryParser.core.QueryNodeException;
23 import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
24 import org.apache.lucene.queryParser.core.nodes.FuzzyQueryNode;
25 import org.apache.lucene.queryParser.core.nodes.QueryNode;
26 import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
27 import org.apache.lucene.queryParser.standard.config.FuzzyConfig;
28 import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
29 import org.apache.lucene.search.FuzzyQuery;
32 * This processor iterates the query node tree looking for every
33 * {@link FuzzyQueryNode}, when this kind of node is found, it checks on the
34 * query configuration for
35 * {@link ConfigurationKeys#FUZZY_CONFIG}, gets the
36 * fuzzy prefix length and default similarity from it and set to the fuzzy node.
37 * For more information about fuzzy prefix length check: {@link FuzzyQuery}. <br/>
39 * @see ConfigurationKeys#FUZZY_CONFIG
43 public class FuzzyQueryNodeProcessor extends QueryNodeProcessorImpl {
46 protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
53 protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
55 if (node instanceof FuzzyQueryNode) {
56 FuzzyQueryNode fuzzyNode = (FuzzyQueryNode) node;
57 QueryConfigHandler config = getQueryConfigHandler();
59 FuzzyConfig fuzzyConfig = null;
61 if (config != null && (fuzzyConfig = config.get(ConfigurationKeys.FUZZY_CONFIG)) != null) {
62 fuzzyNode.setPrefixLength(fuzzyConfig.getPrefixLength());
64 if (fuzzyNode.getSimilarity() < 0) {
65 fuzzyNode.setSimilarity(fuzzyConfig.getMinSimilarity());
68 } else if (fuzzyNode.getSimilarity() < 0) {
69 throw new IllegalArgumentException("No FUZZY_CONFIG set in the config");
79 protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
80 throws QueryNodeException {